<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>未完待续</title>
    <style>
        .box{
          position: relative;
          top: 330px;
          left: 45%;
        }
        body{
            background: url(./白云.jpg);
            background-repeat: no-repeat;
            background-size: cover;
        }
        input{
            width: 250px;
            height: 30px;
        }
        button{
            width: 60px;
            height: 37px;
        }
    </style>

    <style>
        .loader{
            display:flex;
            justify-content: center;
            align-self: center;
        }
        .loader div{
            width: 100px;
            height:100px;
            margin:3rem 0.2rem;
            background:#494948;
            border-radius: 50%;
            animation: loader 0.6s infinite alternate;
            position: relative;
            top: 300px;
        }
        .loader div:nth-child(2){
            animation-delay: 0.2s;
        }
        .loader div:nth-child(3){
            animation-delay: 0.4s;
        }
        @keyframes loader{
            to{
                opacity: 0.1;
                transform: translate3d(0,-100px,0);
            }
        }
    </style>
</head>
<body>
    <div class="loader">
        <div> </div>
        <div> </div>
        <div> </div>
    </div>
    <div class="loader div">

    </div>
    
</body>
</html>